Magic squares are square grids of numbers where the numbers in every row, column and diagonal add up to the same number. They have been around for hundreds (thousands) of years and they are an object of fascination for many mathematicians.
You can do some more reading about magic squares, here are some web sites that I think are particularly interesting:
You can do some more reading about magic squares, here are some web sites that I think are particularly interesting:
Magic Squares Lesson
I ran this in 2011 but now in 2012 I am not sure exactly how I ran the lesson, so this year I am going to write down some notes.